Which piecewise relation defines a function?

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Answer:
see below
Step-by-step explanation:
The relation is a function only if it is single-valued for all values of x.
A: doubly-defined at x = 4.
B: doubly-defined at x = 2
C: a function
D: doubly-defined on the interval (-5, -4]
Answer:C on edg
Step-by-step explanation:
just did the test